EP0036809A1 - Druckwandler, insbesondere zur Verbrennungsmotor-Einlassdruckmessung - Google Patents

Druckwandler, insbesondere zur Verbrennungsmotor-Einlassdruckmessung Download PDF

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Publication number
EP0036809A1
EP0036809A1 EP81400410A EP81400410A EP0036809A1 EP 0036809 A1 EP0036809 A1 EP 0036809A1 EP 81400410 A EP81400410 A EP 81400410A EP 81400410 A EP81400410 A EP 81400410A EP 0036809 A1 EP0036809 A1 EP 0036809A1
Authority
EP
European Patent Office
Prior art keywords
membrane
core
carcass
sensor according
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81400410A
Other languages
English (en)
French (fr)
Other versions
EP0036809B1 (de
Inventor
Christian Rousseau
Claude Lombard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SA
Original Assignee
Renault SA
Regie Nationale des Usines Renault
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SA, Regie Nationale des Usines Renault filed Critical Renault SA
Priority to AT81400410T priority Critical patent/ATE10547T1/de
Publication of EP0036809A1 publication Critical patent/EP0036809A1/de
Application granted granted Critical
Publication of EP0036809B1 publication Critical patent/EP0036809B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/007—Transmitting or indicating the displacement of flexible diaphragms using variations in inductance

Definitions

  • the present invention relates to a pressure sensor whose design allows easy adjustment of significant parameters. This design makes it possible either to accept widened dispersions on the physical and mechanical characteristics of the various elements making up this sensor for a given dispersion of the electrical indication / pressure functional relationship, or to simply modify said functional relationship at a lower cost without changing the definition of different components of said sensor.
  • a difficulty arises if one wants to mount the same computer on a whole range of vehicles due to the fact that the mapping of ignition advance laws as a function intake pressure varies from one type of vehicle to the next.
  • the same difficulty arises if we want, without changing the computer, to slightly modify the ignition advance correction law as a function of the intake pressure, i.e. accept variations in the characteristics of the engine during its evolution, either to take account of temporal or local variations in the composition of fuels.
  • the present invention aims to eliminate these difficulties by the adjustments it allows and relates, for this purpose, to a pressure measuring capsule comprising a flexible membrane transforming a pressure into a force to which is opposed a spring whose position and the prestress can be adjusted axially, which causes the displacement of a central ferrite core in a magnetic ferrite carcass containing a single insulating and cylindrical coil while an amplifier with negative input resistance, of known type, connected to said coil equipped with a tuning capacitor, transforms into a frequency variation the variations of self inductance produced by the displacement of the central core.
  • the pressure sensor according to the invention has the advantage that the position of the carcass in the form of two nested cylinders containing the coil can be adjusted axially relative to the position of the core for a determined initial pressure, which makes it possible to adjust to some extent the initial inductance of said coil and therefore the initial frequency corresponding to the initial pressure.
  • the position of the coil in the magnetic casing can also be adjusted axially along the central core which, by changing the initial position of the coil relative to the core and the distribution in the coil of the leakage fluxes between said core and said carcass, modifies the law of variation of the self inductance , therefore of the frequency, as a function of the position of the core representative of the pressure, and therefore allows adjustment of the slope of the frequency / pressure functional relationship provided by the sensor according to the invention.
  • the tuning capacitor is integrated into the sensor because the dispersions on the value of said capacitor can be compensated for by adjusting the initial self inductance, without requiring adjustment on the electronic ignition module. completed.
  • the pressure sensor comprises a front chamber 1 and a rear chamber 2 separated by a membrane 3 mounted crimped between the body 4 and the cap 5.
  • the chamber 1 is connected by means of a connection tube 6 with the intake manifold, not shown, of an internal combustion engine.
  • This chamber 1 contains a spring 7 guided externally by a tube 8, the end 9 of which serves as a stop for the membrane 3 and the tapped end 10 receives a threaded plug 11 allowing the position of the spring 7 to be adjusted, which allows mounting. springs of fairly dispersed free length.
  • Said plug 11 also makes it possible to adjust the prestressing force of the spring 7, exerted on the membrane 3 held in abutment on the body 4 having an abutment shape 12, so that, for any pressure less than a value previously chosen, no displacement of said membrane can be observed.
  • the tightness of the chamber 1 is ensured on the one hand, by the crimping of the membrane 3 between the cap 5 and the body 4, on the other hand, by the deposition of a known sealant 13 on the plug threaded 11.
  • the displacement of the membrane 3 is transmitted to a central ferrite core 14 bonded to a membrane pusher 15, secured in leaktight manner to the center of said membrane by crimping, of the gyroscopic type for example, on a cup 16, so that the membrane 3 is pinched during crimping between said cup 16 and said pusher 15.
  • the rear chamber 2 is connected to the external atmosphere by a pneumatic filter 17 of known pressure drop so that the pneumatic stiffness of said chamber 2 is most generally negligible compared to the stiffness of the spring 7 and membrane 3 assembly and that 'No pneumatic and thermal effect in this chamber will disturb the operation of the sensor.
  • the central ferrite core 14 moves in a closed ferrite magnetic carcass in the form of two half-nested cylinders, said carcass being produced in two parts 18 and 19, identical or not, pierced with a hole at each end along their axis and held in place by a push spring 20 in a cylindrical support 21 centered in the body 4.
  • an insulating washer 22 is inserted between the push spring 20 and said carcass .
  • the magnetic carcass 18, 19 is a coil 23 of flexible insulating plastic, provided with two wings 24 and 25 ensuring on the one hand, the stop of the wire of the single winding 26 and on the other hand, the maintenance in position of said coil in the magnetic carcass.
  • the ends 27 and 28 of the coil 23 center it in the magnetic carcass 18,19 itself centered in the body 4 by means of the support 21. There is therefore an air wedge between the core 14 and said carcass 18, 19 formed by the thickness of the ends 27 and 28 of the coil 23. These ends 27 and 28 simultaneously guide the movement of the membrane by centering the core 14.
  • the output wires of the winding 26 are wound and then soldered onto the connections of the capacitor 31 previously passed through two small holes on said fins.
  • the sensor output wires are soldered simultaneously to the connections of the capacitor 31 and are connected to an amplifier circuit with negative input resistance 34 so as to constitute a variable pressure / frequency translator. These lead wires are held by a second fuurche 49.
  • the position of the support 21 of the magnetic carcass 18,19, containing the coil 23 with its winding 26 can be adjusted axially, relative to the central core 14 held in a determined position, by an adjustment screw 35 screwed on a adjustment flange 36 crimped on the rear part of the body 4.
  • the thrust spring 20 holds the magnetic carcass 18,19 in its support 21 against said adjustment screw.
  • the position of the coil 23 can be adjusted inside the carcass 18,19 along the central core 14 by a second adjustment screw 37 coaxial with the first 35.
  • the fins 24 and 25 of said coil bear against the cylinder 18 of the magnetic carcass, hold the end 28 of said coil against the adjusting means 37.
  • a braking means of the acrylic resin type prevents the screw 35 from being turned when the position of the coil 23 is adjusted by the screw 37 .
  • the operating mode of the sensor according to the invention is as follows: the flexible membrane 3 transforms the pressure applied to the sensor in effort antagonistically with the spring 8.
  • a relationship between the force applied to said spring by said membrane is shown on the Figure 4 as an example.
  • the shape of this relationship can be modified by changing the nature and physical characteristics of the membrane 3 the dimensions of the cup 16, the geometry of the cap 5, in particular the angle it makes with the crimping plane, finally the stiffness of the spring 7, in that it modifies the operating point of said membrane for a given pressure.
  • This force applied to the spring 7 of a previously selected stiffness moves the central core 14 in the magnetic carcass 18, 19, containing the coil 23 whose winding 26 is connected to the oscillator circuit 34.
  • the displacement of the core 14 modifies the inductance of the winding 26 by changing the effective permeability along the axis of the coil 23.
  • the variation of the inductance of the winding 26 as a function of the displacement of the core 14 results in a variation of frequency of the signal delivered by the circuit amplifier with negative input resistance 34, a variation of which a form is shown in FIG. 5 by way of example.
  • the dimensions of the coil 23 can be varied such as the window winding and the initial diameter of the winding 26, the number of turns and the diameter of the wire of said winding, the dimensions of the holes drilled in the nested cylinders 18 and 19, finally the diameter and the magnetic characteristics of the central core 14. These elements are given as an indication but not limiting.
  • the average slope of this relationship can be continuously adjusted by modifying the position of the coil 23 in the magnetic carcass 18,19.
  • FIG. 5 are shown the curves A and B corresponding to the extreme positions A and B of the coil 23 in FIG. 3.
  • the stress / pressure and frequency / displacement transformations represented in FIGS. 4 and 5 already mentioned can be chosen so that the frequency / pressure functional relationship is substantially linear for a frequency ratio of 1 to 2, as shown in FIG. 6 , for example.
  • the frequencyo ⁇ 1 can be adjusted by the screw 35 which moves the carcass 18,19 containing the coil 23 with its winding 26 relative to the central core 14, maintained in a determined position, which modifies the inductance of said winding.
  • the pressure P1 can be chosen by adjusting the preload of the spring 8 by the threaded plug 12.
  • the slope between the values A and B of said functional relationship can be continuously adjusted by positioning the coil 23 in the carcass 18.19 using of the adjusting screw 37.
  • the stability of the frequency response of the sensor according to the invention as a function of the temperature can be predetermined by choosing the dimensions of the body 4 and of the support 21 for given coefficients of thermal expansion.
  • the use of light material for the production of the body 4 can be retained by improving the rigidity of the said body by reinforcing fins 38 shown in FIG. 2.
  • FIG. 8 shows a second embodiment of the sensor according to the invention in which the spring 39 can operate if necessary both in tension and in compression.
  • the spring 39 is fixed at one of its ends where it has a reduction in diameter winding 40 in a groove 41 formed in the composite stopper 42 for adjusting the spring.
  • the spring 39 has contiguous and prestressed turns 43, screwed onto a threaded sleeve 44 having a recess 45 in which the spring is folded down so as to immobilize it.
  • This socket 44 is integral with two cups 46 and 47 enclosing the flexible membrane 48 subjected to the pressure.
  • the mode of action of the pressure sensor of FIG. 8 is close to that of FIG. 1 since in both cases the displacement of the membrane results in an identical displacement of the core.
  • this embodiment can be mounted without any preload and makes it possible to choose an initial position other than a stop.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Secondary Cells (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP81400410A 1980-03-21 1981-03-17 Druckwandler, insbesondere zur Verbrennungsmotor-Einlassdruckmessung Expired EP0036809B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400410T ATE10547T1 (de) 1980-03-21 1981-03-17 Druckwandler, insbesondere zur verbrennungsmotor- einlassdruckmessung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8006310 1980-03-21
FR8006310A FR2478813A1 (fr) 1980-03-21 1980-03-21 Capteur de pression a l'admission d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0036809A1 true EP0036809A1 (de) 1981-09-30
EP0036809B1 EP0036809B1 (de) 1984-11-28

Family

ID=9239932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400410A Expired EP0036809B1 (de) 1980-03-21 1981-03-17 Druckwandler, insbesondere zur Verbrennungsmotor-Einlassdruckmessung

Country Status (6)

Country Link
US (1) US4381678A (de)
EP (1) EP0036809B1 (de)
AT (1) ATE10547T1 (de)
DE (1) DE3167380D1 (de)
ES (1) ES8202149A1 (de)
FR (1) FR2478813A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071581B1 (de) * 1981-07-29 1986-05-07 KENT-TIEGHI S.p.A. Elektronischer Umsetzer für Fluiddruckwerte
FR2714728A1 (fr) * 1993-12-30 1995-07-07 Elbi Int Spa Transducteur électrique de pression, en particulier pour machines à laver.
FR2755237A1 (fr) * 1996-10-25 1998-04-30 Elbi Int Spa Transducteur electronique differentiel de pression
CN110940453A (zh) * 2018-09-25 2020-03-31 长野计器株式会社 物理量测量装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT387461B (de) * 1986-07-15 1989-01-25 Sprecher Energie Oesterreich Elektronische messeinrichtung
US5219041A (en) * 1992-06-02 1993-06-15 Johnson Service Corp. Differential pressure sensor for screw compressors
CN100464173C (zh) * 2007-03-26 2009-02-25 应城市新世纪摩托车配件有限责任公司 内燃机负压传感器
US8248198B2 (en) * 2009-07-22 2012-08-21 Johanson Manufacturing Corporation Variable inductor with non-magnetic core and method of manufacture therefor
IT201800001092A1 (it) 2018-01-16 2019-07-16 St Microelectronics Srl Sensore di pressione piezoresistivo microelettromeccanico con capacita' di auto-diagnosi e relativo procedimento di fabbricazione
JP6968121B2 (ja) * 2019-04-26 2021-11-17 株式会社鷺宮製作所 圧力センサ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH394659A (de) * 1960-01-22 1965-06-30 Christian Melchior Frederick Anzeigeinstrument mit durch Beschleunigungskräfte nicht beeinflussbarer Anzeige
US3800258A (en) * 1973-01-22 1974-03-26 Gen Motors Corp Pressure-inductance transducer
DE2617576A1 (de) * 1976-04-22 1977-11-03 Chrysler Corp Wandler mit veraenderlicher induktivitaet
FR2377614A1 (fr) * 1977-01-14 1978-08-11 Crouzet Sa Detecteurs de niveaux d'eau pour machines a laver
FR2394075A1 (fr) * 1977-06-07 1979-01-05 Bosch Gmbh Robert Capsule de mesure de la pression, notamment pour mesurer la pression dans la tubulure d'aspiration de moteurs a combustion interne
FR2406184A1 (fr) * 1977-10-12 1979-05-11 Magneti Marelli Spa Capteur de deplacements lineaires
US4161886A (en) * 1978-04-19 1979-07-24 Chrysler Corporation Pressure transducer and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2564221A (en) * 1948-01-22 1951-08-14 Bailey Meter Co Electromagnetic motion responsive device
US2740941A (en) * 1952-05-31 1956-04-03 Edison Inc Thomas A Variable reactors
US2922971A (en) * 1956-03-28 1960-01-26 Sheffield Corp Gaging device
US4300396A (en) * 1980-02-19 1981-11-17 Robertshaw Controls Company Pressure responsive control device and method of making the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH394659A (de) * 1960-01-22 1965-06-30 Christian Melchior Frederick Anzeigeinstrument mit durch Beschleunigungskräfte nicht beeinflussbarer Anzeige
US3800258A (en) * 1973-01-22 1974-03-26 Gen Motors Corp Pressure-inductance transducer
DE2617576A1 (de) * 1976-04-22 1977-11-03 Chrysler Corp Wandler mit veraenderlicher induktivitaet
FR2377614A1 (fr) * 1977-01-14 1978-08-11 Crouzet Sa Detecteurs de niveaux d'eau pour machines a laver
FR2394075A1 (fr) * 1977-06-07 1979-01-05 Bosch Gmbh Robert Capsule de mesure de la pression, notamment pour mesurer la pression dans la tubulure d'aspiration de moteurs a combustion interne
FR2406184A1 (fr) * 1977-10-12 1979-05-11 Magneti Marelli Spa Capteur de deplacements lineaires
US4161886A (en) * 1978-04-19 1979-07-24 Chrysler Corporation Pressure transducer and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071581B1 (de) * 1981-07-29 1986-05-07 KENT-TIEGHI S.p.A. Elektronischer Umsetzer für Fluiddruckwerte
FR2714728A1 (fr) * 1993-12-30 1995-07-07 Elbi Int Spa Transducteur électrique de pression, en particulier pour machines à laver.
FR2755237A1 (fr) * 1996-10-25 1998-04-30 Elbi Int Spa Transducteur electronique differentiel de pression
CN110940453A (zh) * 2018-09-25 2020-03-31 长野计器株式会社 物理量测量装置
CN110940453B (zh) * 2018-09-25 2023-06-23 长野计器株式会社 物理量测量装置

Also Published As

Publication number Publication date
FR2478813A1 (fr) 1981-09-25
ES500562A0 (es) 1982-01-01
FR2478813B1 (de) 1982-12-17
DE3167380D1 (en) 1985-01-10
ATE10547T1 (de) 1984-12-15
US4381678A (en) 1983-05-03
EP0036809B1 (de) 1984-11-28
ES8202149A1 (es) 1982-01-01

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